Cao Ya suffered long-term mistreatment from her adoptive father's family. To escape a forced marriage, relying on the crescent moon birthmark on her body, she called the number on a missing person notice, recognizing her two biological brothers who had been bitterly searching for her for seven years. Faced with cyberbullying and the harassment and false accusations from her adoptive father's family, the three siblings relied on evidence to protect their rights through the law. The girl, who changed her name to Lu Niannian, walked out of her trauma, embracing family affection and campus life. Afterwards, the three siblings launched a family-seeking public welfare project to pass on kindness and help more lost children find their way home.